Freedom

This repository contains the RTL created by SiFive for its Freedom E300 and U500 platforms. The Freedom E310 Arty FPGA Dev Kit implements the Freedom E300 Platform and is designed to be mapped onto an Arty FPGA Evaluation Kit. The Freedom U500 VC707 FPGA Dev Kit implements the Freedom U500 Platform and is designed to be mapped onto a VC707 FPGA Evaluation Kit. Both systems boot autonomously and can be controlled via an external debugger.

Run the following commands to clone the repository and get started:

$ git clone https://github.com/wyz7155/freedom.git
$ cd freedom

#Run this command to update subrepositories used by freedom
$ git submodule update --init --recursive

Next, read the section corresponding to the VC707 kit for instructions on how to use this repo.

Software Requirement

To compile the bootloaders for Freedom U500 VC707 FPGA dev kit, the RISC-V software toolchain must be installed locally and set the $(RISCV) environment variable to point to the location of where the RISC-V toolchains are installed. You can build the toolchain from scratch or download the tools here: https://www.sifive.com/products/tools/

To generate the FPGA bitstream for VC707, Vivado 2016.4 must be installed locally.

Freedom U500 VC707 FPGA Dev Kit

The Freedom U500 VC707 FPGA Dev Kit implements the Freedom U500 platform.

How to build

The Makefile corresponding to the Freedom U500 VC707 FPGA Dev Kit is Makefile.vc707-u500devkit and it consists of two main targets:

• verilog: to compile the Chisel source files and generate the Verilog files.
• mcs: to create a Configuration Memory File (.mcs) that can be programmed onto an VC707 FPGA board.

To execute these targets, you can run the following commands:

$ make -f Makefile.vc707-u500devkit verilog
$ make -f Makefile.vc707-u500devkit mcs

Note: This flow requires Vivado 2016.4. Newer versions are known to fail.

These will place the files under builds/vc707-u500devkit/obj.

Note that in order to run the mcs target, you need to have the vivado executable on your PATH.

Bootrom

The default bootrom consists of a bootloader that loads a program off the SD card slot on the VC707 board.